CN107680549A - Frame rate control method - Google Patents
Frame rate control method Download PDFInfo
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- CN107680549A CN107680549A CN201711006450.1A CN201711006450A CN107680549A CN 107680549 A CN107680549 A CN 107680549A CN 201711006450 A CN201711006450 A CN 201711006450A CN 107680549 A CN107680549 A CN 107680549A
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- frame rate
- rate control
- frame
- control algorithm
- liquid crystal
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
- G09G2340/0435—Change or adaptation of the frame rate of the video stream
Abstract
This application discloses the frame rate control method for liquid crystal gray-scale intensity, including incoming video signal；Refresh rate is obtained according to the vision signal；Judge the relation of the refresh rate and reference value；And one of the first frame rate control algorithm and the second frame rate control algorithm are selected according to judged result.Wherein, the first frame rate of first frame rate control algorithm is more than the second frame rate of second frame rate control algorithm so that multiple successive frames under first frame rate provide the time needed for liquid crystal GTG saltus step.Under low refresh rate, start the second frame rate control algorithm；Under high refresh rate, start the first frame rate control algorithm, both realized target gray scale and shown, also making liquid crystal rotation status, brightness change caused by GTG saltus step reaches brightness ideal value close to ideal value.
Description
Technical field
The present invention relates to the panel Advanced Color Enhancement technology of display device, more particularly, to for realizing liquid crystal GTG
Frame rate control method.
Background technology
Ideally it is input to the bit number and source electrode of the picture signal of time schedule controller (timing controller)
The bit number that driving chip can be handled is consistent.But in order to reduce the manufacturing cost of liquid-crystal apparatus, data processing can be used
The slightly lower source driving chip of number.When the source driving chip using 6bit makes its color display capabilities close to 8bit 16.77M
Or using 8bit source driving chip make its color display capabilities close to 10bit 1074M when, it is necessary to using TFT-LCD
The panel color of (thin film transistor-liquid crystal display, Thin Film Transistor-LCD)
Enhancing technology, i.e. FRC (frame rate control, frame rate control) pixels dithers algorithmic technique, it can make compared with low-bit width
Display effect that source driving chip realizes high-bit width, that color is abundanter.
FRC pixels dithers algorithms, it is that each timeslice becomes a subframe, if display 2nLevel GTG, it is necessary to 2nHeight
Frame.Frame frequency refers to the number of the full frame data scanned in one second, and in order to realize FRC algorithms, a frame is divided into some subframes
(subframe).FRC frame rate control algorithms are substantially the visual persistence using human eye, are obtained by the persistence of vision of human eye
Missing color, realize using the mode of colour mixture a kind of method that target gray scale is shown.Fig. 1 shows that GTG is modulated at the vision of human eye
The schematic diagram of effect diagram, i.e. frame rate control algorithm principle.The bit wide of luma data determines GTG rank, usually,
The GTG that nFRC (n=0,1,2 ...) can be realized is 2n, n is the bit wide of luma data.
The FRC frame rate control algorithms of prior art do not change and changed with refresh rate, when refresh rate increases, during a frame
Between rotated much smaller than liquid crystal from N ranks to the response time of N+1 ranks, cause gray-scale intensity not reach desired level.
Therefore, it is necessary to improved technical scheme is provided to overcome above technical problem present in prior art.
The content of the invention
The main technical problem to be solved in the present invention is to provide a kind of frame rate control method for liquid crystal gray-scale intensity,
Both realized target gray scale to show, also making liquid crystal rotation status, brightness change caused by GTG saltus step reaches bright close to ideal value
Spend ideal value.Solve problems of the prior art.
According to the invention provides a kind of frame rate control method, including：Incoming video signal；According to the vision signal
Obtain refresh rate；Judge the relation of the refresh rate and reference value；And the control of the first frame rate is selected to calculate according to judged result
One of method and the second frame rate control algorithm；Wherein, the first frame rate of first frame rate control algorithm is more than described the
Second frame rate of two frame rate control algorithms so that multiple successive frames under first frame rate provide liquid crystal GTG saltus step
The required time.
Preferably, the refresh rate is more than the reference value, starts the first frame rate control algorithm；The refresh rate is less than
Equal to the reference value, start the second frame rate control algorithm.
Preferably, the reference value is refreshing frequency set in advance.
Preferably, first frame rate control algorithm is the frame rate control algorithm in 16 frame periods.
Preferably, second frame rate control algorithm is the frame rate control algorithm in 8 frame periods.
Preferably, in first frame rate control algorithm, the liquid crystal GTG is completed in 16 continuous frame periods
Saltus step.
Preferably, described 16 continuous frame periods are 8 frame periods each to continuously display to be formed.
Preferably, in second frame rate control algorithm, the jump of the liquid crystal GTG is completed in 8 continuous frame periods
Become.
Preferably, the vision signal of the input is vision signal of the input to the high-bit width of time schedule controller.
Compared to prior art, the present invention is with reference to the 8 frame period frame rate control algorithm and 16 frame period frame speed
The scope of application of rate control algolithm, under low refresh rate, start 8 frame period frame rate control algorithms；Under high refresh rate, start
16 frame period frame rate control algorithms, target gray scale was both realized and had shown, and liquid crystal rotation status is jumped close to ideal value, GTG
Brightness change reaches brightness ideal value caused by change.Solve the FRC algorithms not change with refresh rate change in the prior art, when
When refresh rate increases, a frame time is rotated to the response time of N+1 ranks much smaller than liquid crystal from N ranks, causes gray-scale intensity not reach
The problem of desired level.
Brief description of the drawings
By the description to the embodiment of the present invention referring to the drawings, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from, in the accompanying drawings：
Fig. 1 shows the schematic diagram of the frame rate control algorithm principle of time-domain.
Fig. 2 shows the frame rate control algorithm schematic diagram in 8 frame periods in the present invention.
Fig. 3 shows the frame rate control algorithm schematic diagram in 16 frame periods in the present invention.
Fig. 4 shows the time diagram needed for the saltus step of liquid crystal GTG in the present invention.
Fig. 5 a show reality of the frame rate control algorithm in 8 frame periods under high refresh rate and preferable GTG saltus step brightness
Curve comparison schematic diagram.
Fig. 5 b show that reality of the frame rate control algorithm in 16 frame periods under high refresh rate and preferable GTG saltus step are bright
Write music line contrast schematic diagram.
Fig. 6 shows the schematic flow sheet of the frame rate control method for liquid crystal gray-scale intensity of the embodiment of the present invention.
Embodiment
The present invention is more fully described hereinafter with reference to accompanying drawing.In various figures, identical element is using similar attached
Icon is remembered to represent.For the sake of clarity, the various pieces in accompanying drawing are not necessarily to scale.Furthermore, it is possible to it is not shown some
Known part.
It describe hereinafter many specific details of the present invention, such as the structure of device, material, size, processing work
Skill and technology, to be more clearly understood that the present invention.But just as the skilled person will understand, it can not press
The present invention is realized according to these specific details.
The present invention can be presented in a variety of manners, some of embodiments explained below.
Fig. 1 shows the schematic diagram of the frame rate control algorithm principle of time-domain.Due to the visual effect of human eye, it is seen that it is bright
Degree is the cumulative effect of all subframes.It is assumed that each pixel is only able to display black and white two kinds of colors, continuous four frame shows one
Individual picture, GTG is 100% when defining a frame of continuous pixels four all black, all white of the frame of continuous pixels four
When GTG be 0%.As shown in figure 1, from top to bottom, five GTGs 100% can be produced, 75%, 50%, 25%, 0%, it is seen that
Frame rate control algorithm FRC is realized only with black, the white display for adding three kinds of GTGs.One is shown according to continuous eight frame
Individual picture, then frame rate control algorithm FRC can realize the display of nine kinds of different GTGs.
Fig. 2 shows the frame rate control algorithm schematic diagram in 8 frame periods.As shown in Fig. 2 FRC frame rate control algorithms in figure
The processing method using 8 frames as the cycle is employed, missing color, FRC frame rate control algorithms are obtained using the residual effect of human eye
Display effect that the source driving chip made compared with low-bit width realizes high-bit width, that color is abundanter.As figure, 1 frame period are complete
Picture into corresponding GTG display effect shows that 8 continuous frame periods show that 8 corresponding GTGs show that the GTG of result is drawn
Face, using the residual effect of human eye, the frame rate control algorithm in 8 frame periods completes liquid crystal GTG using 8 continuous frame periods
Saltus step, i.e., for the vision of people, the equivalent display result in continuous 8 frame period is shown as a grey menu, week and
Renew, mix gray level information using the persistence of vision of human eye, be nearly completed the display to Object LC GTG, that is, completed to height
The display for whole liquid crystal GTGs that the picture signal of bit wide can be shown.Inputted so as to be realized by FRC frame rate control algorithms
Image signal transformation output to the high-bit width of signal control part is the picture signal of low-bit width.
Fig. 3 shows the frame rate control algorithm schematic diagram in 16 frame periods.As shown in figure 3, FRC frame rate control algorithms in figure
Employ the processing method using 16 frames as the cycle.Such as figure, the residual effect of human eye, the frame rate control algorithm in 16 frame periods are utilized
The saltus step of liquid crystal GTG is completed using 16 continuous frame periods, i.e., for the vision of people, continuous 16 frame period etc.
Effect shows that result is shown as a grey menu, goes round and begins again, and mixes gray level information using the persistence of vision of human eye, is nearly completed
Display to Object LC GTG, that is, complete the display of whole liquid crystal GTGs that can be shown to the picture signal of high-bit width.
The grey menu that the equivalent display result in continuous 8 frame periods is shown is in the frame rate control algorithm in 16 frame periods
Each continuously display what is formed by 8 above-mentioned frame periods.
Fig. 4 shows the time diagram needed for the saltus step of liquid crystal GTG in the present invention.Gray scale response (GTG, Gray To
Gray the time required for) expression liquid crystal display jumps to target gray scale from basic GTG.Part gray-scale saltus step as illustrated
The required time, such as from being 16.207 milliseconds the time required to 224 GTG saltus steps to 128 GTGs.From 0 GTG or 255 in figure
It is shorter the time required to GTG saltus step to other GTGs.
Fig. 5 a show reality of the frame rate control algorithm in 8 frame periods under high refresh rate and preferable GTG saltus step brightness
Curve comparison schematic diagram.With reference to Fig. 4, when the liquid crystal rank to N+1 rotationally-varying from N ranks exemplified by, when refresh rate than it is relatively low when,
Such as refresh rate, when being 60Hz, the time per frame is about 16.7ms, approaches or micro- to be more than liquid crystal rotationally-varying to N+1 from N ranks
The time of rank is the response time of gray scale variation；When refresh rate is 120Hz, the time of each frame is about 8.3ms, the time
It is the response time of gray scale variation from the N ranks rotationally-varying time to N+1 ranks much smaller than liquid crystal.Dotted line waveform shown in Fig. 5 a is
The desired level change curve of GTG saltus step, solid line waveform are the intrinsic brilliance change curve of GTG saltus step.The frame speed in 8 frame periods
For rate control algolithm under high refresh rate, time that each grey menu is shown is rotationally-varying to N+1 ranks from N ranks much smaller than liquid crystal
Response time, liquid crystal is not yet rotated to state corresponding to target gray scale when thus grey menu is shown.Now actual gray saltus step
Brightness do not reach the brightness of ideal gray level saltus step.Such as Fig. 5 a, when the liquid crystal rank to N+1 rotationally-varying from N ranks, actual gray is jumped
Deviation a be present in the brightness of change and the brightness of ideal gray level saltus step.
Fig. 5 b show that reality of the frame rate control algorithm in 16 frame periods under high refresh rate and preferable GTG saltus step are bright
Write music line contrast schematic diagram.As shown in Figure 5 b, exemplified by when the liquid crystal rank to N+1 rotationally-varying from N ranks, dotted line waveform is jumped for GTG
The desired level change curve of change, solid line waveform are the intrinsic brilliance change curve of GTG saltus step.With reference to Fig. 4, when refresh rate is
During 120Hz, the time of each frame is about 8.3ms, and the time is from the N ranks rotationally-varying time to N+1 ranks much smaller than liquid crystal
The response time of gray scale variation, the time of two frames is 16.6ms, close to the response time of liquid crystal GTG saltus step.Add in pixel
The electric field time doubles so that for liquid crystal rotation status close to ideal value, brightness change caused by GTG saltus step reaches brightness reason
Want to be worth.Under high refresh rate, in the time of every two frame, liquid crystal is completed from N ranks to the state transition of N+1 ranks, liquid crystal rotation status
Close to ideal value, brightness change caused by GTG saltus step reaches brightness ideal value.The frame rate control algorithm in 16 frame periods is in height
Under refresh rate, the time that each grey menu is shown is thus grey close to liquid crystal from the N ranks rotationally-varying response time to N+1 ranks
Liquid crystal is rotated to state corresponding to target gray scale when rank picture is shown.The brightness of now actual gray saltus step reaches ideal gray level jump
The brightness of change, in the absence of luminance deviation.
Fig. 6 shows the schematic flow sheet of the frame rate control method for liquid crystal gray-scale intensity of the embodiment of the present invention.This
The frame rate control method for liquid crystal gray-scale intensity of embodiment comprises the following steps：
S301：Incoming video signal, video input signals are vision signal of the input to the high-bit width of time schedule controller；
S302：Refresh rate is obtained, refresh rate is obtained according to the vision signal of input；
S303：Judge whether refresh rate is more than reference value for the relation of refresh rate and reference value, and reference value is set in advance
Refreshing frequency, one of the first frame rate control algorithm and the second frame rate control algorithm are selected according to judged result；
S304：Start the first frame rate control algorithm, when refresh rate is more than reference value, startup the first frame rate control is calculated
Method；
S305：Start the second frame rate control algorithm, when refresh rate is less than or equal to reference value, startup the second frame rate control
Algorithm.
Preferably, the first frame rate control algorithm is the frame rate control algorithm in 16 frame periods.
Preferably, the second frame rate control algorithm is the frame rate control algorithm in 8 frame periods.
Preferably, the first frame rate of the first frame rate control algorithm is more than the second frame speed of the second frame rate control algorithm
Rate so that multiple successive frames under the first frame rate provide the time needed for liquid crystal GTG saltus step.
With reference to the FRC frame rate control algorithms in above-mentioned 8 frame period and being applicable for the FRC frame rate control algorithms in 16 frame periods
Scope, the FRC frame rate control algorithms in 8 frame periods in the case where refresh rate is not high using can both realize that target gray scale is shown,
Also liquid crystal rotation status can be made, and close to ideal value, brightness change caused by GTG saltus step reaches brightness ideal value.16 frame periods
FRC frame rate control algorithms use in the case of refresh rate height, can both realize that target gray scale is shown, can also make liquid crystal contorted
For state close to ideal value, brightness change caused by GTG saltus step reaches brightness ideal value.Therefore the present invention combines both the above algorithm,
Under low refresh rate, start 8 frame period frame rate control algorithms；Under high refresh rate, start the control of 16 frame period frame rate and calculate
Method, target gray scale was both realized and had shown, also making liquid crystal rotation status, brightness change caused by GTG saltus step reaches close to ideal value
Brightness ideal value.Problems of the prior art are solved, it is necessary to which explanation, the control of 8 frame period of the application frame rate are calculated
In method, the equivalent display result in continuous 8 frame period is shown as a grey menu.In 16 frame period frame rate control algorithms,
The equivalent display result in continuous 16 frame period is shown as a grey menu.Certainly, 8 frame period frame rate of the invention control
Algorithm and 16 frame period frame rate control algorithms are presently preferred embodiments of the present invention, in actual applications, can also use other frame
Several cycle frame rate control algorithms solves problems of the prior art, i.e., need to only meet that continuous frame is all in frame algorithm
The saltus step of GTG is completed in phase.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply and deposited between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability includes, so that process, method, article or equipment including a series of elements not only will including those
Element, but also the other element including being not expressly set out, or it is this process, method, article or equipment also to include
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Other identical element also be present in process, method, article or equipment including key element.
For example above according to embodiments of the invention, these embodiments do not have all details of detailed descriptionthe, do not limit yet
The invention is only specific embodiment.Obviously, as described above, can make many modifications and variations.This specification is chosen and had
Body describes these embodiments, is in order to preferably explain the principle and practical application of the present invention, so that art skill
Art personnel can be used using modification of the invention and on the basis of the present invention well.The present invention only by claims and its
The limitation of four corner and equivalent.
Claims (9)
1. a kind of frame rate control method, including：
Incoming video signal；
Refresh rate is obtained according to the vision signal；
Judge the relation of the refresh rate and reference value；And
One of first frame rate control algorithm and the second frame rate control algorithm are selected according to judged result；
Wherein, the first frame rate of first frame rate control algorithm is more than the second frame of second frame rate control algorithm
Speed so that multiple successive frames under first frame rate provide the time needed for liquid crystal GTG saltus step.
2. frame rate control method according to claim 1, wherein, the refresh rate is more than the reference value, starts the
One frame rate control algorithm；The refresh rate is less than or equal to the reference value, starts the second frame rate control algorithm.
3. frame rate control method according to claim 2, wherein, the reference value is refreshing frequency set in advance.
4. frame rate control method according to claim 2, wherein, first frame rate control algorithm was 16 frame periods
Frame rate control algorithm.
5. frame rate control method according to claim 2, wherein, second frame rate control algorithm was 8 frame periods
Frame rate control algorithm.
6. frame rate control method according to claim 4, wherein, in first frame rate control algorithm, 16 companies
The saltus step of the liquid crystal GTG is completed in the continuous frame period.
7. frame rate control method according to claim 6, wherein, described 16 continuous frame periods are that 8 frame periods are each
To be formed from continuously displaying.
8. frame rate control method according to claim 5, wherein, in second frame rate control algorithm, 8 are continuous
Frame period in complete the saltus step of the liquid crystal GTG.
9. frame rate control method according to claim 1, wherein, the vision signal of the input is input to sequential control
The vision signal of the high-bit width of device processed.
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| CN107680549B (en) | 2022-11-15 |
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